1·In this article, we review three rapid methods to predict manure nutrient content, including hydrometer, conductivity meter and Near Infrared Reflectance Spectroscopy.
本文介绍了三种快速预测畜禽粪便肥料成分含量的方法，包括比重计测定法、电导仪测定法以及近红外光谱分析法。
2·The requirement in accuracy for mechanical analysis with the hydrometer is presented also.
根据国内外资料提出了使用比重计法分析土颗粒的精度要求。
3·A hydrometer used to determine the specific gravity of acid solutions.
比重计：量度液体或溶液的比重的仪器。
4·This paper offers a hydrometer method for determining size distribution of ultra-fine particle in coal water slurry and discusses its mechanism, operation procedures and date calculation.
提出了水煤浆中超微细颗粒粒度的比重计检测方法；
5·Hydrometer: An instrument used for measuring the specific gravity of a liquid or solution.
比重计：量度液体或溶液的比重的仪器。